How would unencapsulate an unsorted array structure’s fetch algorithm?

[dseals22]

Here is a sample of my code to help better understand the question. Any suggestions would be nice. When it says unencapsulate the structure, does it mean that I will reveal the implementation details of the deepCopy() method. Referring to specifically line 7 as the question in hand which is return data[i].deepCopy(); Here is partial code below:

//access the node (assumes the node is in the structure)
i=0;
while(targetKey!=data[i].key()){
i++
}
 
// return a a copy of the node to the client 
return data[i].deepCopy();